--- a/src/hotspot/share/gc/shared/gcArguments.cpp	Wed Mar 28 11:38:47 2018 +0200
+++ b/src/hotspot/share/gc/shared/gcArguments.cpp	Wed Mar 28 11:38:47 2018 +0200
@@ -25,68 +25,12 @@
 
 #include "precompiled.hpp"
 #include "gc/shared/gcArguments.hpp"
-#include "gc/serial/serialArguments.hpp"
-#include "logging/log.hpp"
-#include "memory/allocation.inline.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/globals.hpp"
 #include "runtime/globals_extension.hpp"
-#include "runtime/java.hpp"
-#include "runtime/os.hpp"
-#include "utilities/defaultStream.hpp"
 #include "utilities/macros.hpp"
 
-#if INCLUDE_ALL_GCS
-#include "gc/parallel/parallelArguments.hpp"
-#include "gc/cms/cmsArguments.hpp"
-#include "gc/g1/g1Arguments.hpp"
-#endif
-
-GCArguments* GCArguments::_instance = NULL;
-
-GCArguments* GCArguments::arguments() {
-  assert(is_initialized(), "Heap factory not yet created");
-  return _instance;
-}
-
-bool GCArguments::is_initialized() {
-  return _instance != NULL;
-}
-
-bool GCArguments::gc_selected() {
-#if INCLUDE_ALL_GCS
-  return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
-#else
-  return UseSerialGC;
-#endif // INCLUDE_ALL_GCS
-}
-
-void GCArguments::select_gc() {
-  if (!gc_selected()) {
-    select_gc_ergonomically();
-    if (!gc_selected()) {
-      vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
-    }
-  }
-}
-
-void GCArguments::select_gc_ergonomically() {
-#if INCLUDE_ALL_GCS
-  if (os::is_server_class_machine()) {
-    FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
-  } else {
-    FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
-  }
-#else
-  UNSUPPORTED_OPTION(UseG1GC);
-  UNSUPPORTED_OPTION(UseParallelGC);
-  UNSUPPORTED_OPTION(UseParallelOldGC);
-  UNSUPPORTED_OPTION(UseConcMarkSweepGC);
-  FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
-#endif // INCLUDE_ALL_GCS
-}
-
-void GCArguments::initialize_flags() {
+void GCArguments::initialize() {
 #if INCLUDE_ALL_GCS
   if (MinHeapFreeRatio == 100) {
     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
@@ -100,34 +44,3 @@
   }
 #endif // INCLUDE_ALL_GCS
 }
-
-jint GCArguments::initialize() {
-  assert(!is_initialized(), "GC arguments already initialized");
-
-  select_gc();
-
-#if !INCLUDE_ALL_GCS
-  if (UseParallelGC || UseParallelOldGC) {
-    jio_fprintf(defaultStream::error_stream(), "UseParallelGC not supported in this VM.\n");
-    return JNI_ERR;
-  } else if (UseG1GC) {
-    jio_fprintf(defaultStream::error_stream(), "UseG1GC not supported in this VM.\n");
-    return JNI_ERR;
-  } else if (UseConcMarkSweepGC) {
-    jio_fprintf(defaultStream::error_stream(), "UseConcMarkSweepGC not supported in this VM.\n");
-    return JNI_ERR;
-#else
-  if (UseParallelGC || UseParallelOldGC) {
-    _instance = new ParallelArguments();
-  } else if (UseG1GC) {
-    _instance = new G1Arguments();
-  } else if (UseConcMarkSweepGC) {
-    _instance = new CMSArguments();
-#endif
-  } else if (UseSerialGC) {
-    _instance = new SerialArguments();
-  } else {
-    ShouldNotReachHere();
-  }
-  return JNI_OK;
-}